function withData(param) {
  return param < 10 ? '0' + param : String(param);
}
function getLoopArray(start, end) {
  let starti = start || 0;
  let endi = end || 1;
  let array = [];
  for (let i = starti; i <= endi; i++) {
    array.push(withData(i));
  }
  return array;
}
function getMonthDay(year, month) {
  let flag = year % 400 === 0 || (year % 4 === 0 && year % 100 !== 0);
  let array = null;
  
  switch (month) {
    case '01':
    case '03':
    case '05':
    case '07':
    case '08':
    case '10':
    case '12':
      array = getLoopArray(1, 31);
      break;
    case '04':
    case '06':
    case '09':
    case '11':
      array = getLoopArray(1, 30);
      break;
    case '02':
      array = flag ? getLoopArray(1, 29) : getLoopArray(1, 28);
      break;
    default:
      array = '月份格式不正确，请重新输入！';
  }
  return array;
}
function getNewDateArry() {
  // 当前时间的处理
  let newDate = new Date();
  let year = withData(newDate.getFullYear());
  let mont = withData(newDate.getMonth() + 1);
  let date = withData(newDate.getDate());
  let hour = withData(newDate.getHours());
  let minu = withData(newDate.getMinutes());
  let seco = withData(newDate.getSeconds());
  
  return [year, mont, date, hour, minu, seco];
}
function dateTimePicker(startYear, endYear, date) {
  // 返回默认显示的数组和联动数组的声明
  let dateTime = [];
  let dateTimeArray = [[], [], [], [], [], []];
  let start = startYear || 1978;
  let end = endYear || 2100;
  // 默认开始显示数据
  let defaultDate = date ? [...date.split(' ')[0].split('-'), ...date.split(' ')[1].split(':')] : getNewDateArry();
  // 处理联动列表数据
  /* 年月日 时分秒 */
  dateTimeArray[0] = getLoopArray(start, end);
  dateTimeArray[1] = getLoopArray(1, 12);
  dateTimeArray[2] = getMonthDay(defaultDate[0], defaultDate[1]);
  dateTimeArray[3] = getLoopArray(0, 23);
  dateTimeArray[4] = getLoopArray(0, 59);
  dateTimeArray[5] = getLoopArray(0, 59);
  
  dateTimeArray.forEach((current, index) => {
    dateTime.push(current.indexOf(defaultDate[index]));
  });
  
  return {
    dateTimeArray: dateTimeArray,
    dateTime: dateTime,
  };
}
module.exports = {
  dateTimePicker: dateTimePicker,
  getMonthDay: getMonthDay,
};